HTC is preparing an Android 4.0 upgrade for 16 of its existing smartphones, but the company still has few details on when users will get the upgrade, according to a blog posted on Tuesday.

The company is in the early stages of rolling out Android 4.0 for the Sensation and Sensation XE, and upgrades will be more widely available in the next few weeks. The update for the Sensation 4G and Sensation XL will then follow, the blog post said.

HTC is working with carriers to schedule updates for the other smartphones, it said.

Google launched Android 4.0, also known as Ice Cream Sandwich, with the intention of lessening fragmentation in the Android market, and five months after launch it is starting to take off with upgrades of existing phones as well as new products running it.

On Tuesday, Samsung Electronics said that it has started upgrading its Galaxy S II phone. The company also manufactures the first phone to run Android 4.0, the Galaxy Nexus.

Besides planning to upgrade existing products, HTC has also announced a number of new products that will use the latest version of Google's operating system, including the One X, which has a quad-core processor and a 4.7-inch HD screen.

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